linux-kernel - Re: 5.0.0-rc8-next-20190301+: kernel bug at fs/inode.c:513

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Date:   Tue, 5 Mar 2019 00:14:26 +0100
From:   Pavel Machek <pavel@....cz>
To:     "Theodore Y. Ts'o" <tytso@....edu>
Cc:     adilger.kernel@...ger.ca, jack@...e.cz,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: 5.0.0-rc8-next-20190301+: kernel bug at fs/inode.c:513

Hi!

> (Adding linux-mm and moving linux-ext4 and linux-kernel to the bcc
> list...)

Umm. So I ... bcc them too?

> On Mon, Mar 04, 2019 at 05:02:55PM +0100, Pavel Machek wrote:
> > 
> > This happened on trying to sync filesystems with unison:
> > 
> > Any ideas?
> > 
> > Should I be forcing fsck soon?
> > 								Pavel
> > 
> > [12717.827444] ------------[ cut here ]------------
> > [12717.827465] kernel BUG at fs/inode.c:513!
> 
> It seems unlikely that fsck is going to help.  The BUG_ON in question
> appears to be:
> 
> 	BUG_ON(inode->i_data.nrexceptional);
> 
> This is an in-memory accounting variable which seems to be related to
> tracking DAX and shadow page entries --- and it seems very unlikely to
> be the sort of thing triggered by an on-disk corruption.
> 
> Do you have a reliable repro for this?  If so, the next step would be
> to bisect...

It happened just once... so I don't yet know.

I'm not even sure what file was affected. unison was showing some kind
of png from openstreetmap cache, but I could read it using md5sum just
fine.

-next is normally pretty boring, but it seems to get pretty
interesting around -final release...

Thanks,
									Pavel
-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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